Improvement in rock-drills



IUNrTnn STATES PATENT OFFICE.

GREGORY MLHAUPT, OF BUFFALO, NEW YORK.

IMPROVEMENT IN ROCK-DRILLS.

Specification forming part of Letters Patent No. 48,301, dated June 20, 1865.

To all whom 'it may concern:

Be itknown that I, GREGORY MLHAUPT, of the city of Buffalo, eountyof Erie, and State of New York, have invented a certain new and Improved Rock-Drilling Machine; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, making a part of this specification, in which- Figure I isa sectional elevation of my said machine. Fig. II is a rear elevation, and Fig. III is atop plan, of same. Fig. IV isa detailed view of cam.

`Letters of like name and kind refer to like parts in each of the figures.

The nature of4 this invention consists in so supporting the drill-stock in a vertically-reciprocating gate or cross-head (the upward movement of which is produced by a rack and pinion or other similar means, and the downward motion by gravity) that while the motion of such cross-head is fixed and definite the drill-stock is so only .in its upward movement, its downward movement being governed entirely by the drill striking the rock, so that as the hole being drilled increases in depth the drill feeds itself, (within certain limits,) and strikes quick, hard, and effective blows.

The frame-work of the machine, which supports the operating parts, consists, principally, of the vertical posts A, horizontal bed-frame A', and oblique braces A2.

-The drill-stock (represented at B) is supported in the frame or cross-head O, which moves in slides D, secured to the vertical posts A. The upward motion of the cross-head, and with it the drill-stock, is produced by the aetion of the pinion E upon the rack F, secured to the cross-head, and the downward movement thereof is produced by the action of gravity, the pinion being disengaged from its shaft E', as hereinafter described, on the completion of its upward movement, and allowed to run backward as the cross-head descends. The drill-stock is fitted loosely in the cross-head, but has a collar, B', which bears against the top of the crosshead and causes it to move therewith in its upward motion. The downwardmotion of the cross-head is definite and uniform, but that of the drill-stock coincides therewith only until such time as the drill strikes, when it stops, andthe cross-head com-` pletes its downward motion alone.

in the next upward motion strikes the collar B', after which it is carried with the crosshead to the completion of its upward motionw` In this manner the drill is made to feed itself jusit as fast as and no faster than it cuts, until a depth inthe hole being drilled equal to the l i movement of the crosshead or such part thereof as will give a sufficient blow to the i At such time by moving the drill is reached. collar B up ou the drill-stock a renewed capacity to f'eed may be obtained, An intermittent rotary motion is given to the drill-stock,

which causes the drill to strike each time a little in advance of its former cut, so as to drill l the ratchet-wheel and drill-stock rotated at each upward movement of the cross-head by the wedge or cam J on the cross-head striking the arm J on the lower end of a rock-shaft, J2, to the upper e'nd of which is secured the arm J 3, carrying the pawl G.

I will now describe the mannei'in which the pinion E is engaged and disengaged with its shaft E to produce theupward motion of the cross-head, 85e., and permit the downward motion thereof. The movement of the shaft E is continuous and uniform, and is given by any convenient motive power in a common manner. It carries a sliding clutch, K, having its counterpart (with which it engages) on the pinion E. The sliding motion of the clutch out and in gear with the pinion is effected by Vthe combined action of the cam L and springlever M, the spring-lever throwing it out of gear and the cam in gear. The cam L is placed upon the shaft E', which runs loose therein and is held stationary and prevented from turning therewith by being bolted to the fram ing A A. It acts upon the clutch through the The drill--` stock remains stationary until the cross-head l clutch-arms L Z2, which are kept continually in contact therewith by the action ot' the lever M. The proportions ot' the cam are determined by the assumed diameter of the pinion E, which in this instance is such that two-thirds of its revolution will give the required upward movements to the cross-head. This proportion requires the cam to be capable of holding the clutch in gear with the pinion through just two-thirdsof arevolution, and then to allow the spring-lever to immediately throw the clutch out ot' gear and give the remaining third ofthe revolution to the descent of the cross-head by i gravity.

By special reference to Fig. 1V it will be seen that the cam consists of two circular ca mtracks concentric with the shaft E, the plane of Whose snrl'ace is at right angles to the shaft through two-thirds of their circumference, or from l to 2, and inclined thereto through the remaining third, or from 2 to 3, the inclined parts acting on the clutch-arms to throw the clutch in gear and the straight parts to hold it in gear until the upward motion ot' the crosshead is completed, at which time it will be forced out, the clutch-arms passing onto the inclined parts again by the action of the spring-lever, thus throwing the clutch out of gear and allowing the cross-head to drop. This operation is repeated at each revolution ofthe shaft E', and a unil'orm reciprocating motion given to the cross-head and drill.

By the combination of parts and the motion thereof above described it is believed a rockdrilling machine of unequaled efficacy is produced, and possessing` the further advantages of simplicity and durability.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, 1s-

1. The combination ot' the drill-stock B with a vertically-reciprocating frame or cross-head C, the upward motion ot' which is produced by the action ot' the pinion E upon the rack F, or other equivalent means, and the downward motion thereof by gravity, in the mauuer and for the purposes substantially as described.

2. The combination ofthe cam L, clutch K, pinion E, and rack F, arranged and operating as described, to produce the reciprocating motion ot' cross-head C, for the purposes set forth.

3. Giving an intermittent rotary motion to the drill-stock B by theupward motion ofthe cross-head acting on the ratchet-wheel G through the medium of the cani-Wedge J, rock shaft arms J J3, and pawl in the manner substantially as described.

Gr REGORY M LHAUPT.

Witnesses C. Roenes, G. S. PRINCE. 

